The PowerShares Global Progressive Transportation Portfolio (PTRP) began trading today on Nasdaq.

The new fund tracks an index of global companies focused on technologies that use greener, more efficient sources of energy that enable cleaner, less costly and more efficient means of transportation.

The Index has four core focus areas: alternative vehicles; rail and subway systems; sea, land, air and intermodal; and transport innovation.

Top holdings include Mexican airport operator Grupo Aeroportuario del Sureste S.A. de C.V. (ASR), natural gas fleet supplier Clean Energy Fuels Corp. (CLNE) and container terminal operator Hamburger Hafen und Logistik AG (B28SK0).

See the PowerShares ETF Directory for a complete listing.  See Investing in Clean Energy with ETFs for more on green investing.